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    • Cummins Marine Forum Topics
    • Yanmar 4LHA STE Port Engine Lag

      This topic has 2 replies, has 3 voices, and was last updated byTony Athens 5 years ago

      June 4, 2018 at 5:05 pm My port engine is struggling getting past 1800 RPMs as I increase speed to get up on plane. It seems to lag behind the starboard engine by 400-600 rpms and eventually catches up with the starboard engine to get up on plane and max RPMs. Any suggestions on where to start?

      Started by: Kenneth Athans in: All Other Marine Diesels

      2 Replies
      June 4, 2018 at 7:10 pm Post history of all past use and past operation over the last few years operation.. Exact boat model? Max RPM in neutral? Max RPM in gear? Typical Cruise RPM? Tony

      Last Post by: Tony Athens posted: 5 years ago

    • Yanmar 4LHA STEs Black Smoke 1800-2000 Rpm — 2001 Albemarle Express

      This topic has 12 replies, has 4 voices, and was last updated byBill Fuller 6 years ago

      June 19, 2017 at 1:42 pm Iā€™m experiencing black smoke from both of my engines ONLY while trolling in the 1800-2000 rpm range. Boat seems to be plowing through the water and putting strain on engines. No smoke at idle or when the boat gets up on plane. My friend has the same engines and 2002 Albemarle 280 express. He has about 600 hours on his engines and just replaced the turbos. He is experiencing the same black smoke issue in that rpm range. I purchased the boat…

      Started by: Kenneth Athans in: All Other Marine Diesels

      12 Replies
      June 23, 2017 at 10:40 am Ken, You don’t need to run the boat at WOT with a photo tach hooked up. I think you already had the info I was asking about. I am just a bit confused on your reading, probably all on my end. You already gave the info, but could you list Tach = 3300 Strobe = ? With 4 blades you may well be a bit over propped. If you look at the spec sheet Rob posted you will see that Yanmar would like to see these engines turn up 3450 to 3550 RPM under …

      Last Post by: Bill Fuller posted: 6 years ago

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